A119221 Numbers k such that the k-th triangular number contains only digits {5,6,8}.

3, 10, 11, 36, 105, 108, 114, 1316, 3363, 105516, 343091, 1316705, 3657011, 10638485, 13310789, 33336636, 37028788, 1145936870, 108320504576528, 3333333366663363, 105725008289010683

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119220. See A119034 for a table of cross-references.

Extensions

a(21) from Tyler Busby, Mar 31 2023